# Diff Viewer

Source: https://athas.dev/docs/git-diff

Compare working-tree, staged, and historical changes with inline or side-by-side diffs.

Athas includes a powerful diff viewer.

## Viewing Diffs

### From Source Control

1. Open the Source Control panel
2. Click on any changed file
3. The diff viewer opens showing changes

### From Commit History

1. Open the commit history
2. Click on any commit
3. Click on a file to view its diff

## Diff Modes

### Inline Diff

Shows additions and deletions inline:

- Green background for additions
- Red background for deletions

### Side-by-Side Diff

Shows old and new versions side by side:

- Left pane: original
- Right pane: modified

## Gutter Indicators

In the editor, the gutter shows Git change indicators:

- **Green bar**: Added lines
- **Red bar**: Deleted lines
- **Yellow bar**: Modified lines

Click on these indicators to see the original content.

## Inline Blame

Enable inline blame in **Settings > Git** or toggle with `Cmd/Ctrl+Shift+B`.

## What a diff proves

A working-tree diff shows saved changes; a staged diff shows what the next commit includes. Compare the correct versions and check the active branch. A clean diff does not prove tests passed. Return to [Source Control](https://athas.dev/docs/git-integration) to stage and commit the reviewed change.